2 # SPDX-License-Identifier: GPL-2.0-or-later
3 # Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
5 # Test creates several zram devices with different filesystems on them.
6 # It fills each device with zeros and checks that compression works.
16 # Test will create the following number of zram devices:
18 # This is a list of parameters for zram devices.
19 # Number of items must be equal to 'dev_num' parameter.
22 # The zram sysfs node 'disksize' value can be either in bytes,
23 # or you can use mem suffixes. But in some old kernels, mem
24 # suffixes are not supported, for example, in RHEL6.6GA's kernel
25 # layer, it uses strict_strtoull() to parse disksize which does
26 # not support mem suffixes, in some newer kernels, they use
27 # memparse() which supports mem suffixes. So here we just use
28 # bytes to make sure everything works correctly.
29 zram_sizes="2097152" # 2MB
31 zram_filesystems="ext4"
36 for i in $(seq $dev_start $dev_end); do
40 dd conv=notrunc if=/dev/zero of=zram${i}/file \
41 oflag=append count=1 bs=1024 status=none \
42 > /dev/null 2>&1 || break
45 echo "zram$i can be filled with '$b' KB"
47 local mem_used_total=`awk '{print $3}' "/sys/block/zram$i/mm_stat"`
48 local v=$((100 * 1024 * $b / $mem_used_total))
49 if [ "$v" -lt 100 ]; then
50 echo "FAIL compression ratio: 0.$v:1"
55 echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
71 if [ $ERR_CODE -ne 0 ]; then